Screw drain plug



FIG. 1 is a front perspective view of our new design illustrating the characteristic features of the design, which resides in its shape together with having an axially blind, left-handed threaded opening.

FIG. 2 is a side elevational view of the design illustrated in FIG. 1, all sides being identical.

FIG. 3 is a front elevational view of the screw plug design shown in FIG. 1; and,

FIG. 4 is a rear elevational view of the screw plug design shown in FIG. 1. 

The ornamental design for a screw drain plug, as shown and described. 